Plugin targets UWP platforms (Windows 10, HoloLens, etc) which uses .NET Core 5.0. In plugin inspector .dll is set as "don't process", but editor still throws errors when reimporting.

Reproducible on 5.3.5f1, 5.3.6f1, 5.4.0f3.

Repro steps:
1. Open project "uwpdlltest.zip".
2. Reimport plugin in editor and observe the error in the console.

Error in the console:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> Mono.Cecil.AssemblyResolutionException: Failed to resolve assembly: 'System.Runtime, Version=4.0.20.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a'
at Mono.Cecil.BaseAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name, Mono.Cecil.ReaderParameters parameters) [0x00000] in <filename unknown>:0
at Mono.Cecil.BaseAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name) [0x00000] in <filename unknown>:0
at Mono.Cecil.DefaultAssemblyResolver.Resolve (Mono.Cecil.AssemblyNameReference name) [0x00000] in <filename unknown>:0
at Mono.Cecil.MetadataResolver.Resolve (Mono.Cecil.TypeReference type) [0x00000] in <filename unknown>:0
at Mono.Cecil.ModuleDefinition.Resolve (Mono.Cecil.TypeReference type) [0x00000] in <filename unknown>:0
at Mono.Cecil.TypeReference.Resolve () [0x00000] in <filename unknown>:0
at Mono.Cecil.Mixin.CheckedResolve (Mono.Cecil.TypeReference self)

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